WO2020007832A1 - Bouchon fileté doté d'un joint d'étanchéité réglé - Google Patents

Bouchon fileté doté d'un joint d'étanchéité réglé Download PDF

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Publication number
WO2020007832A1
WO2020007832A1 PCT/EP2019/067690 EP2019067690W WO2020007832A1 WO 2020007832 A1 WO2020007832 A1 WO 2020007832A1 EP 2019067690 W EP2019067690 W EP 2019067690W WO 2020007832 A1 WO2020007832 A1 WO 2020007832A1
Authority
WO
WIPO (PCT)
Prior art keywords
outer seal
seal
container
closure
head plate
Prior art date
Application number
PCT/EP2019/067690
Other languages
German (de)
English (en)
Inventor
Günter Krautkrämer
Original Assignee
Bericap Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bericap Gmbh & Co. Kg filed Critical Bericap Gmbh & Co. Kg
Priority to US17/058,635 priority Critical patent/US11939124B2/en
Priority to CN201980045218.XA priority patent/CN112469637B/zh
Priority to BR112020024220-9A priority patent/BR112020024220A2/pt
Priority to EP19736350.0A priority patent/EP3817990B1/fr
Publication of WO2020007832A1 publication Critical patent/WO2020007832A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D51/00—Closures not otherwise provided for
    • B65D51/16—Closures not otherwise provided for with means for venting air or gas
    • B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
    • B65D51/1661—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element by means of a passage for the escape of gas between the closure and the lip of the container mouth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
    • B65D39/08—Threaded or like closure members secured by rotation; Bushes therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2251/00—Details relating to container closures
    • B65D2251/20—Sealing means

Definitions

  • the present invention relates to a plastic closure for positive and tight placement on the neck of a liquid container with a head plate provided for covering a container opening and an outer seal running approximately parallel to the edge of the head plate, which is intended for engagement with the outside of a container neck defining the container opening is, as well as inside the outer seal and parallel to this circumferential inner seal, which is intended for engagement with the inside of the container neck, wherein the outer and the inner seal each protrude from the inside of the head plate in the direction of the container neck.
  • the circumferential seals essentially extend parallel to one another and approximately perpendicularly or slightly inclined to the plane defined by the head plate.
  • the invention relates to a screw cap made of plastic for liquid containers, the screw cap comprising a head plate, a cylindrical cap jacket with an internal thread that defines an axis of the closure, and an annular inner seal that is to be brought into engagement with the cylindrical inner surface of the container neck after application to the container neck and has an annular outer seal to be brought into engagement with the cylindrical outside of a container neck, the outer and inner seals each extending in a predominantly axial direction from the inside of the head plate.
  • Such plastic closures are used, among other things, for beverage bottles.
  • the present invention relates in particular to closures for such containers in which an uncontrolled excess pressure can arise. This applies, for example, to containers which are filled with a fermentable liquid and in which a considerable overpressure can build up (after contamination with germs).
  • Such containers when filled with the products in question, generally do not have a high internal pressure, with the exception of a slight overpressure which is specifically applied by filling with an inert gas and which essentially serves to keep the bottles, which are mostly consist of thin-walled PET material, to make it stable overall and thus stackable, typically several containers are combined into a bundle and are stacked on top of one another in this form.
  • the closure according to the invention has two mutually independent seals, one of which comes into sealing contact with the inside, the other with the outside of a corresponding container neck (deleted text shifted to page 3 :)
  • the closures used for this purpose are generally relatively short axially and also have a relatively steep, mostly multi-start thread, which allows the container to be opened and closed quickly , on the other hand, the closure offers only a comparatively small hold, and also allows ventilation or venting of the container during the short opening process only to a limited extent.
  • the invention is of course not limited to this special application, but relates to closures for all containers in which an overpressure of z. B is more than 4 bar, especially if such overpressure can arise in an uncontrolled manner.
  • the inner seal withstands only a limited overpressure due to its geometric arrangement and design. To limit the internal pressure through the internal seal, therefore, either no or only minor additional measures are required, as will be explained below. However, the external seal can withstand a very considerable excess pressure in the known closures.
  • the present invention is based on the object of providing a closure and also a container with a closure, which generally prevent the closure from breaking off under high excess pressure.
  • the outer seal has a weakened area in at least one circumferential section, the closure being designed such that the outer seal yields in the weakened area at a lower internal pressure than without the weakened area, especially in the weakened area, yields earlier than in the other areas.
  • the weakening area preferably extends over an angle sector measured with respect to the axis, which depending on the type of weakening can be limited to less than 1 ° circumferential angle, but in other embodiments also to an angle sector of 20 to 90 °.
  • the weakened area could also extend over the entire circumference, for example in the form of a spiral groove.
  • the task is solved in that the closure does not allow a correspondingly high overpressure to arise from the outset, i.e. leaks and gas escapes when the pressure inside the container exceeds a certain, predeterminable level, and that without an additional pressure valve to be attached.
  • the lower section (facing away from the head plate) of the inner seal is typically chamfered radially inwards and at the end is curved inwards in order to ensure when the closure is placed on the container neck that the inner seal slides into the opening of the container neck.
  • the lower end of the inner seal has therefore when the outer bead on the Is inside the container neck, a clear clearance to this inside.
  • the inner seal on its outside has a radially outwardly projecting area or bulge which, after corresponding compression by the container neck, rests against the inside of the container neck under elastic prestress.
  • An excess pressure which arises in a container provided with the closure generally causes the top plate of the closure to bulge.
  • the inner seal is moved a little way up to the free opening of the neck, and at the same time the inner seal tilts radially inwards and the pressure of the gas or liquid which can act on the lower section of the inner seal from the outside additionally contributes to a radially inward Swiveling the inner seal so that it lifts off at least locally from the inside of the container neck at a certain excess pressure. The inner seal will then leak.
  • the internal pressure then acts on the outer seal.
  • the bulging of the head plate also results in a reduction in the diameter of the outer seal, at least on your attachment to the head plate, which leads to an even tighter pressing of the outer seal on the container neck. Without measures to reduce the internal pressure, there is then the risk of sudden detachment when the closure is opened.
  • the outer seal also yields at a lower pressure than would be the case if the outer seal had no weakening area.
  • the weakened area is therefore a means of deliberately limiting overpressure.
  • the desired overpressure value at which the weakened area yields to the outer seal and allows the gas under pressure in the container (partially) to escape can be set well.
  • the weakened area will be set so that the pressure at which the outer seal opens in the weakened area is slightly above the overpressure with which the container is filled anyway for reasons of stability, i.e. with a pressure between 1 and 2.5 bar , the exact adherence to certain pressure values not being important as long as the opening pressure of the weakening area is clearly below the values that could cause the closure to come off the container neck dangerously.
  • a reasonable upper limit for the internal pressure of containers, which are intended for carbon-free, for example, is around 3 - 4 bar for a closure with a two-start thread with a 360 ° wrap angle and a nominal diameter of 38 mm.
  • Such a reasonable upper limit for the pressure varies with the diameter of the neck and the design of the thread and can tend to be larger with a smaller diameter and also smaller with a larger diameter.
  • the outer seal of the screw closure according to the invention expediently has a region which is referred to below as the sealing region and which is generally regarded as the axial region which comes into sealing contact with a container neck.
  • this is an area of the outer seal with a constant inner diameter that at least partially encompasses the middle third of the axial length of the outer seal.
  • the end of the outer seal which is remote from the head plate and is in the form of a ring or ring web, is (seen in an axial section) generally slightly curved or beveled radially outwards, likewise in order to slide onto the container neck when the closure is placed on it
  • the outer seal being expanded and stretched radially overall so that it rests against the container neck under elastic prestress and in this way resists a relatively high internal pressure.
  • the sealing area of an outer seal comprises at least part of the central axial third of the outer seal, and the sealing area can then be defined accordingly with reference to the closure alone.
  • the radially outwardly curved lower end section of the outer seal is therefore not in contact with the neck of the container and cannot make any significant contribution to the sealing.
  • the actual sealing area of the outer seal is located in the middle third, based on the axial length of the outer seal. This is the sealing area defined above, which according to the present invention is to be influenced by targeted measures or to be set to a specific opening pressure.
  • the weakened area consists of a circumferential section of the outer seal, which has a reduced wall thickness compared to the rest of the outer seal, the outer seal in this weakened area having the same inner radius as the outer seal, but a smaller outer radius. Due to the constant internal diameter, such an outer seal lies along its entire circumference with the sealing area on the outer surface of a container neck seals well within the required pressure range for which the container and closure are designed under normal conditions.
  • this section of reduced wall thickness can be more easily stretched and pressed radially outwards in the event of overpressure in the interior of the container, so that the outer seal in this area leaks when the Pressure exceeds a predetermined limit.
  • such a configuration provides a closure which is completely sealed under normal circumstances and which is completely sealed off by both an inner seal and an outer seal, the head plate bulging only strongly in the case of a larger (e.g.> 4 bar) internal pressure, as a result, the inner seal tilts radially inward and lifts axially and / or radially from the inner surface of the container neck, whereupon the greater pressure then acting on the outer seal is reduced over the respective weakened area.
  • the reduced wall thickness in the axial direction extends from a free axial (lower) end to the upper third of the outer seal, based on the axial length of the outer seal outside the weakened area.
  • the maximum outer diameter of the inner seal i.e. H. of the so-called “bead” of the outer seal
  • H. of the so-called “bead” of the outer seal is provided at an axial distance between only 0.4 and 1.2 mm, preferably less than 1 mm, from the stop surface, so that this area is very resistant to any movements of the head plate, in particular a bulge is strongly influenced and thus lifts off from the inner surface of the container neck at least after reaching a certain excess pressure and at least in places. Gas (or liquid) under excess pressure can then escape into the area in front of the outer seal, the weakened area of the outer seal limiting the pressure which is created by allowing the gas under pressure to pass if a limit pressure is exceeded.
  • the sealing bead of the inner seal which defines its maximum diameter, can be raised in the area of the rounding of the inner edge of the bottle neck or beyond, so that the inner seal definitely gas towards or into the outer seal Area between the outer and inner seal.
  • the weakened area consists of a circumferential section of the outer seal that is axially shortened in the angle sector a. Because the outer seal is shortened in a circumferential section and the shortening also covers the sealing area, there is only an axially very short section of the angular sector Sealing area on the outside of the neck of the container, which leads to the fact that the outer seal in this weakened area alone by the fact that it is also lifted a little bit axially by the bulging head plate, with a relatively low pressure inside the container yields and locally lifts off the bottle neck, so that any excess pressure is reduced in this way.
  • one embodiment provides that the axial length of the outer seal in the weakening region is less than two thirds of the axial length of the outer seal outside the weakened region.
  • the two aforementioned embodiments can also be combined with one another without any problems. as shown in the embodiment of Figure 1.
  • the axial shortening can be approximately one third compared to the outer seal in the remaining area and the wall thickness should be less than half the wall thickness of the outer seal outside the weakened area amount, the reduced wall thickness extending axially into the upper third of the outer seal, based on its axial length outside the weakened area.
  • a groove or a rib runs on the inner surface of the outer seal, which in any case extends over the axial width of the sealing region of the outer seal.
  • a corresponding groove would provide a sealing channel that bridges the sealing area, via which gas under pressure in the interior of the container, which may have already passed through the inner seal, can be discharged to the outside without the pressure inside the container continuing elevated.
  • a web or a rib which protrudes radially inwards on the surface of the outer seal and otherwise also extends over the axial width of the sealing area, acts in a similar way, since on both sides of such a rib the sealing surface of the outer seal from the Bottle neck is raised, and in this way also forms a passage for gas under pressure.
  • these embodiments have an outer seal that permanently has a deliberately set, small leak.
  • This leak can already by a kapillararti passage of z. B. 0.03 mm 2 cross section allow sufficient gas to pass, such as is released in a fermentation process, for example.
  • this passage may also have to allow liquid to pass through.
  • a capillary opening is not a problem under normal sales and storage conditions, because under such conditions the inner seal still effectively seals the interior of the container from the environment.
  • a corresponding groove and analogously also a corresponding rib should have the smallest possible cross-section which meets the above conditions and which, for example, is less than 0.05 mm 2 , in particular less than 0.02 mm 2 , with a corresponding groove and analog a corresponding rib, for example, could have a width and a depth of 0.1 mm each, so that the total cross section does not exceed 0.01 mm 2 .
  • the flow cross-section at least for gas, can also be significantly below the aforementioned values and, for example, only be 0.0001 mm 2 , which is sufficient to reduce a slowly increasing gas pressure, but on the other hand to prevent the ingress of contaminants and germs, as long as there is no reverse pressure difference opposes a great resistance.
  • the internal seal in any case prevents the penetration of pathogens and the like into the container and the risk that possibly only the mouth of the container neck is contaminated is in the above-described embodiments with groove or rib on the inner surface of the outer seal is very small in view of the small cross section of the groove or the rib.
  • the fact that the inner seal has an axial length of at least 2 mm with an end section that tapers conically from its maximum diameter to one end axially in front of one end also helps.
  • the pressurized gas in a container has no axial counterpart in the conical area outside the inner cross section of the inner seal and can thus contribute to the inner seal being pressed radially inward and thereby becoming leaky
  • the inner seal it has also proven expedient for the inner seal to give way in the event of excessive internal pressure if the maximum outer diameter of the inner seal is at least 1.5 mm larger than its maximum inner diameter.
  • the maximum outer diameter of the inner seal is also smaller than the minimum inner diameter of the outer seal, because a container neck opening has to be included between them, the corresponding run-up bevels and roundings on the seals and / or on the container neck opening making it possible for the maximum outer diameter of the inner seal and the minimum diameter of the outer seal differs only slightly, and in particular by significantly less than it corresponds to the wall thickness of the neck of the container.
  • the head plate has an annular section between the outer and inner seal, which defines an axial stop surface for the end face of a container neck opening.
  • the wall thickness in the area of this annular stop surface can be the same as in the central area of the head plate, but it can in particular also be larger or smaller, the latter being preferred in order to make the head plate easier to move so that it is more inside the container when overpressure occurs bulges.
  • the invention also relates to a container with a plastic closure, the container having a container neck which is designed for the form-fitting and tight engagement with a plastic closure according to one of claims 1 to 14.
  • the invention also relates to a container which has a container neck with an external thread and a screw cap, the maximum outer radius of the inner seal being 0.2 to 0.4 mm larger than the nominal inner diameter of the bottle neck.
  • the inner diameter of the outer seal which is constant in the sealing area, is also 0.2 to 0.4 mm smaller than the nominal outer diameter of the neck of the container.
  • FIG. 1A shows a section containing the axis of a closure through a screw cap placed on a bottle neck according to a first embodiment of the invention, the illustration being limited to the area of the seals and showing a normal section of the outer seal.
  • Figure 1 B shows a section perpendicular to the axis of the closure in Figure 1A along the section line B-B
  • Figure 2 shows a section corresponding to Figure 1A of a closure on a container under increased internal pressure.
  • FIG. 3A shows a section through the section of the same closure according to FIG. 1A diametrically opposite the section according to FIG. 1A with an outer seal weakened in one segment
  • Figure 3B shows a section along the line B3-B3 in Figure 3A
  • FIG. 4 shows a view according to FIG. 3A with an additionally drawn contour of the outer seal outside the weakened area.
  • FIG. 5A shows a plan view of a section of the inner surface of an outer seal according to a further embodiment, which has a cutout in the sealing area.
  • FIG. 5B shows a horizontal section through a closure according to FIG. 5A, the section plane running through the cutout and the section showing only a section of the closure on a bottle neck
  • FIG. 6A shows a plan view of a section of the inner surface of an outer seal according to a further embodiment, which has a projection in the sealing area.
  • FIG. 6B shows a horizontal section through a closure according to FIG. 6A, the section plane running through the projection and the section showing only a section of the closure on a bottle neck
  • FIG. 7A shows a section analogous to FIG. 1A of a further embodiment
  • FIG. 7B shows a horizontal section through a closure according to FIG. 6A, the section plane running through the weakened area of the outer seal and the section showing only a section of the closure on a bottle neck, and
  • FIG. 8 For a better overview, a cross section through the complete closure according to FIGS. 1 and 3.
  • Figure 1 shows an axial section through the edge of a container neck with attached closure 100.
  • the container neck is described below as a bottle neck and shows the contour of a bottle neck edge of a PET bottle with 30 or 43 mm thread.
  • the inner seal 5 is shown here overlapping with the inner surface of the bottle neck 20, but this is only intended to indicate that the outer surface of the inner seal, in particular the bead 5 ′ provided on the outer surface, rests with elastic prestress on the inner surface of the bottle neck 20, as is also the case is shown in Figure 2, wherein Figure 2 also shows a domed by an increased internal pressure head plate 1.
  • the increased pressure also causes the conical outer surface between the maximum diameter of the bead 5 'and the lower free end of the inner seal 5 to be acted upon by the increased inner pressure, so that from a certain inner pressure the inner seal 5 or its bulge projecting outward from the Lifts the inner surface of the bottle neck 20 and thus allows the pressure to escape into the area between the outer seal 7 and the inner seal 5.
  • the state shown in FIG. 2 corresponds to a situation in which the inner seal 5 has been raised and tilted to such an extent that it is lifted off the inner surface 22 of the bottle neck and is leaking.
  • the rounding provided on the inner upper edge of the bottle neck in accordance with customary standards in turn contributes to the fact that the inner seal, at least locally, loses the sealing contact with the bottle neck at least locally.
  • FIG. 1A A part of the closure 100 can be seen in FIG. 1A, which has a head plate 1, a cap jacket 2 with a screw thread 3 and an inner seal 5 and an outer seal 7.
  • the closure 100 When the closure 100 is screwed onto a bottle neck 20, the mouth of the bottle neck 20 slides between the outer seal 7 and the inner seal 5, generally until the end face 24 of the bottle neck mouth abuts a stop face 4 of the annular section 14 on the underside the head plate 1, which is located between the two seals 5 and 7.
  • the inner seal 5 tends to be tilted inwards, as initially done by the radial inward pushing of the bead 5 'occurs when engaging with the inner sealing surface of the bottle neck 20.
  • the top plate 1 has a somewhat larger wall thickness D, the different wall thicknesses d, D not being a mandatory feature, but which can favor or simplify the desired overpressure limitation of the closure.
  • a groove can be provided on the inside of the head plate 1 at the transition from the stop surface 4 and the inner seal 5, which groove makes the inner part of the head plate 1 with the inner seal 5 even more mobile than the radially outer one Section 14 does what the bulging of the head plate 1 and the tilting and axial lifting of the inner seal 5 up to leakage again facilitates.
  • the bead 5 With a sufficiently high internal pressure, which also acts on the outside of the inner seal 5, provided that it has no opposite pressurized surface in the axial direction, the bead 5 'lifts off at least in some places from the inner surface 22 of the bottle neck 20, so that the Pressure can escape until the bulge of the head plate 1 has decreased accordingly and the elastic restoring forces of the inner seal bring the bead 5 'of the inner seal 5 back into sealing engagement with the bottle neck.
  • FIG. 3A shows the same closure as FIG. 1A, but the sectional plane runs through a weakened area 6 of the outer seal 7.
  • the weakened area 6 in this case consists of an optionally axially shortened and reduced in wall thickness section 6 of the outer seal 7, which has the same inner diameter as the outer seal 7 in the rest of the area, but has a significantly smaller outer diameter.
  • Figure 3B shows a section through the line B3-B3 in Figure 3A.
  • the inner seal 5 lies against the inner surface 21 of the bottle neck 20 (the overlap of the inner seal 5 with the bottle neck 20 in FIG. 3A is only intended to represent the tension-free state before the inner seal 5 or its bead 5 ′ is pressed inwards by the bottle neck) ,
  • the upper third of the outer seal 7 adjoining the head plate is located in the region of a radius of curvature at the upper edge of the neck opening and thus does not come into contact with the
  • the bottle neck and the lower third are already radially widened in order to facilitate the sliding of the mouth of the bottle neck 20 into the space between the two seals 5 and 7 when the closure is placed on a bottle neck.
  • seal 7 is now shortened to half or the entire axial length of the outer seal 7 over a certain angle sector a, which may be 30 °, for example, only a relatively axially relatively short section of the outer seal 7 with the outer side 21 of the bottle neck is left in this area 20 in contact, wherein a relatively small excess pressure within the outer seal 7 is sufficient to lift this relatively short, still sealing section from the outside 21 of the bottle neck 20 and thus to relieve pressure.
  • a which may be 30 °, for example, only a relatively axially relatively short section of the outer seal 7 with the outer side 21 of the bottle neck is left in this area 20 in contact, wherein a relatively small excess pressure within the outer seal 7 is sufficient to lift this relatively short, still sealing section from the outside 21 of the bottle neck 20 and thus to relieve pressure.
  • the outer seal 7, of which two end sections can still be seen in the angular section shown in FIG. 3B, is not only shortened axially in the weakening segment within the angular sector a, but is also replaced by a weakened area 6 with reduced wall thickness, which, however, has the same inner diameter as the inner seal 7 otherwise.
  • the weakening area 6 of the outer seal is thus sealing against the outside 22 of the bottle neck 20 and protects against the ingress of germs before first use, d. H. on the way from the bottler to the consumer.
  • the dimensional relationships between the weakened area 6 of the outer seal 7 are also illustrated again in FIG. 4, where, in addition to the weakened area 6 shown in section, the contour of the outer seal 7, as is present in the areas of the outer seal 7 outside the weakened area 6, was also drawn. It can also be seen in FIG. 4 that the wall thickness d of the head plate in the area between the inner seal 5 and the outer seal 7 is somewhat less than the wall thickness D radially inside the inner seal 5.
  • FIG. 8 shows the complete closure in the sectional plane of FIGS. 1A and 3A.
  • 1A corresponds to the area I with a dashed frame in FIG. 8
  • FIG. 3A corresponds to the area III with a dashed frame in FIG. 8.
  • FIG. 5A shows a small section of the head plate 1 with the seal 7 extending downward from the head plate 1, FIG. 5A being a plan view of the inner surface of the outer seal 7, which normally comes into sealing contact with the outer surface 22 of the bottle neck.
  • the inner surface of the outer seal has a small groove-like recess 6 ', which bridges in the axial direction the area in which the seal otherwise lies tightly against the outer side 22 of the bottle neck 20.
  • This is shown again schematically in a section running through the recess 6 'in FIG. 5B.
  • the cross section of the groove-like recess 6 ' is less than 0.5 mm 2 , in particular less than 0.2 mm 2 .
  • the recess 6 ' which is approximately semicircular in the section according to FIG. 5B could, for example, have a radius of 0.1 to 0.2 mm.
  • FIGS. 6A and 6B represent a further embodiment, in which instead of a recess 6 ', a radially inwardly projecting web or a rib or a projection 6 "is provided. Even if the wall thickness of the outer seal 7 in the circumferential direction of the outer seal and on both sides of the projection or the rib 6 "is constant, short sections of the inner seal 7 are nevertheless lifted off the outer surface 22 of the bottle neck 20 on both sides of the rib 6", which effectively leads to the fact that on both sides of the rib 6 ′′, in turn, two small recesses 6 ′ which are wedge-shaped in cross section are formed.
  • the rib 6 ′′ is dimensioned such that the total cross section of the recesses 6 ′ thus formed is not more than 0.5 mm 2 , preferably less than 0.2 mm 2 . It goes without saying that here, too, the rib 6 ′′ extends in a straight line or curved in the axial direction over the sealing area of the outer seal 7, so that the recess 6 ′ connects the space between the outer and inner seal to the outside of the bottle neck 20.
  • FIG. 7 finally shows yet another embodiment in which the outer seal 7 has been axially shortened in an angular range a, so that in the angular sector a of the weakened area 16 only a very small contact axially between the outer seal 7 or the weakened area 16 and the bottle neck 20 or whose outer surface 22.
  • This is dimensioned such that when the head plate is arched, the outer seal, despite its proximity to an imaginary pivot point of the bulged part of the head plate 1, still shifts axially upwards sufficiently to open a gas passage.
  • the invention is essentially based on two effects, namely on the one hand, to use the arching of the head plate which arises under internal pressure, in order first to open the inner seal to such an extent that undesirably high internal pressure of e.g. B more than 3 bar is passed on to the outer seal. Secondly, this outer seal is the same at least in an angular sector weakened that when exposed to the z. B. 3 bar pressure also yields and the pressure can be reduced by gas leakage from the container.
  • the invention also relates in particular to a combination of a container neck or a container with a plastic closure, the maximum outer diameter of the outer seal being between 0. 2 and 0.4 mm is larger than the corresponding inner diameter of the container neck opening, while the inner diameter of the outer seal is also approximately 0.2 to 0.4 mm smaller than the corresponding outer diameter of the container neck in the respective angular position.
  • the closure according to the invention is particularly well suited for containers with cylindrical cylinder necks which have an inner diameter of 40 or 30 mm, but can also be used for smaller closure diameters of, for example, 28 mm.
  • the embodiments described above are therefore adapted in terms of their dimensions to corresponding standardized container necks or bottle necks.

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  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Abstract

L'invention concerne un bouchon en plastique destiné à être placé par complémentarité de forme et à étanchéité sur le col d'un récipient à liquide, comprenant une plaque de tête (1) conçue pour recouvrir une ouverture de récipient, et un joint d'étanchéité externe (7) s'étendant le long du bord de la plaque de tête (1), lequel joint d'étanchéité externe est conçu pour être mis en prise avec la face externe d'un col de récipient (20) délimitant l'ouverture de récipient, ainsi qu'un joint d'étanchéité interne (5) s'étendant au sein du joint d'étanchéité externe (7) et parallèle à ce dernier, qui est conçu pour être mis en prise avec la face interne du col de récipient, les joints d'étanchéité externe et interne (7, 5) étant respectivement sensiblement perpendiculaires ou légèrement inclinés par rapport à une face interne (11) de la plaque de tête (1). Selon l'invention, pour produire un bouchon ainsi qu'un récipient comprenant un bouchon qui empêchent de manière générale le bouchon de sauter sous l'effet d'une surpression élevée, le joint d'étanchéité externe (7) comporte une zone d'affaiblissement (6, 6', 6") dans au moins une partie périphérique, de sorte que le joint d'étanchéité externe (7) soit descellé lors d'une surpression interne plus faible que lorsque le joint d'étanchéité externe est réalisé sans la zone d'affaiblissement.
PCT/EP2019/067690 2018-07-05 2019-07-02 Bouchon fileté doté d'un joint d'étanchéité réglé WO2020007832A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US17/058,635 US11939124B2 (en) 2018-07-05 2019-07-02 Screw closure with controlled seal
CN201980045218.XA CN112469637B (zh) 2018-07-05 2019-07-02 具有受控密封件的螺旋封闭件
BR112020024220-9A BR112020024220A2 (pt) 2018-07-05 2019-07-02 fecho de rosca, recipiente para líquidos com um gargalo de recipiente e fecho plástico para encaixar neste
EP19736350.0A EP3817990B1 (fr) 2018-07-05 2019-07-02 Bouchon fileté doté d'un joint d'étanchéité réglé

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018116295.2A DE102018116295A1 (de) 2018-07-05 2018-07-05 Schraubverschluss mit kontrollierter Dichtung
DE102018116295.2 2018-07-05

Publications (1)

Publication Number Publication Date
WO2020007832A1 true WO2020007832A1 (fr) 2020-01-09

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PCT/EP2019/067690 WO2020007832A1 (fr) 2018-07-05 2019-07-02 Bouchon fileté doté d'un joint d'étanchéité réglé

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US (1) US11939124B2 (fr)
EP (1) EP3817990B1 (fr)
CN (1) CN112469637B (fr)
BR (1) BR112020024220A2 (fr)
DE (1) DE102018116295A1 (fr)
WO (1) WO2020007832A1 (fr)

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US11591141B2 (en) * 2020-07-08 2023-02-28 Veraseal Pty Limited Closures and vessels with closures
WO2022027051A1 (fr) * 2020-07-29 2022-02-03 Saint-Gobain Performance Plastics Corporation Fermeture, système combiné de contenant et de fermeture, et procédé d'utilisation de ceux-ci

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Also Published As

Publication number Publication date
US11939124B2 (en) 2024-03-26
CN112469637B (zh) 2022-08-09
US20210206545A1 (en) 2021-07-08
EP3817990B1 (fr) 2024-02-14
DE102018116295A1 (de) 2020-01-30
CN112469637A (zh) 2021-03-09
BR112020024220A2 (pt) 2021-02-17
EP3817990C0 (fr) 2024-02-14
EP3817990A1 (fr) 2021-05-12

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